package civicinity.ist.psu.edu.utils;

import android.graphics.Camera;
import android.graphics.Matrix;
import android.view.animation.Animation;
import android.view.animation.Transformation;
/**
 * Source : 
 * @author kyunghan
 *
 */
public class Rotate extends Animation{
	private final float mFromDegrees;
	private final float mToDegrees;
	private final float mCenterX;
	private final float mCenterY;
	private final float mDepthZ;
	private final boolean mReverse;
	private Camera mCamera;
	//private Camera mCamera;
	
	public Rotate(float fromDegrees, float toDegrees, float centerX, float centerY, float depthZ, boolean reverse) {
		mFromDegrees = fromDegrees;
		mToDegrees = toDegrees;
		mCenterX = centerX;
		mCenterY = centerY;
		mDepthZ = depthZ;
		mReverse = reverse;
	}
	
	@Override
	public void initialize(int width, int height, int parentWidth, int parentHeight) {
		super.initialize(width, height, parentWidth, parentHeight);
		mCamera = new Camera();
	}
	
	@Override
	public void applyTransformation(float interpolatedTime, Transformation t) {
		final float fromDegrees = mFromDegrees;
		float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);
		
		final float centerX = mCenterX;
		final float centerY = mCenterY;
		final Camera camera = mCamera;
		
		final Matrix matrix = t.getMatrix();
		
		camera.save();
		
		if(mReverse) {
			camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
		}
		else {
			camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));
		}
		
		camera.rotateY(degrees);
		camera.getMatrix(matrix);
		camera.restore();
		
		matrix.preTranslate(-centerX, -centerY);
		matrix.postTranslate(centerX, centerY);
	}
}
